feat(client): 库存商品抽屉增加供应商与批次号信息行（两端，原型同步）

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

client/lib/screens/inventory/inventory_list_screen.dart

@@ -129,6 +129,8 @@ class _InventoryListScreenState extends ConsumerState<InventoryListScreen> {
       status: _statusOf(item),
       inventoryId: item.id,
       inventoryStatus: item.status,
+      supplier: item.supplierName.isEmpty ? null : item.supplierName,
+      batchNo: item.batchNo.isEmpty ? null : item.batchNo,
       onStatusChanged: () =>
           ref.read(inventoryListProvider.notifier).reload(),
     );

client/lib/widgets/product_editor_drawer.dart

@@ -46,6 +46,8 @@ Future<void> showProductEditorDrawer(
   String? status, // 在售 / 库存 / 已售（三态显示标签）
   int? inventoryId, // 库存行 id：非空时状态行显示挂售 switch
   String? inventoryStatus, // stock / on_sale / sold（switch 初始态）
+  String? supplier, // 供应商（生产日期行后，非空才显示，2026-07-14）
+  String? batchNo, // 批次号（生产日期行后，非空才显示，2026-07-14）
   VoidCallback? onStatusChanged, // switch 切换成功后回调（列表刷新）
 }) {
   // 窄屏：底部 sheet 形态（原型 m-inventory openItem 内嵌公开页编辑）
@@ -64,6 +66,8 @@ Future<void> showProductEditorDrawer(
             status: status,
             inventoryId: inventoryId,
             inventoryStatus: inventoryStatus,
+            supplier: supplier,
+            batchNo: batchNo,
             onStatusChanged: onStatusChanged),
       ),
     );
@@ -94,6 +98,8 @@ Future<void> showProductEditorDrawer(
                   status: status,
                   inventoryId: inventoryId,
                   inventoryStatus: inventoryStatus,
+                  supplier: supplier,
+                  batchNo: batchNo,
                   onStatusChanged: onStatusChanged),
             ),
           ),
@@ -119,6 +125,8 @@ class _ProductEditorDrawer extends ConsumerStatefulWidget {
   final String? status;
   final int? inventoryId;
   final String? inventoryStatus;
+  final String? supplier;
+  final String? batchNo;
   final VoidCallback? onStatusChanged;
   const _ProductEditorDrawer({
     required this.productId,
@@ -128,6 +136,8 @@ class _ProductEditorDrawer extends ConsumerStatefulWidget {
     this.status,
     this.inventoryId,
     this.inventoryStatus,
+    this.supplier,
+    this.batchNo,
     this.onStatusChanged,
   });
 
@@ -397,6 +407,13 @@ class _ProductEditorDrawerState extends ConsumerState<_ProductEditorDrawer> {
     if ((p.productionDate ?? '').isNotEmpty) {
       rows.add(('生产日期', b(p.productionDate!, mono: true)));
     }
+    // 批次号/供应商行（生产日期后，非空才渲染，2026-07-14）
+    if ((widget.batchNo ?? '').isNotEmpty) {
+      rows.add(('批次号', b(widget.batchNo!, mono: true)));
+    }
+    if ((widget.supplier ?? '').isNotEmpty) {
+      rows.add(('供应商', b(widget.supplier!)));
+    }
     if (widget.qty != null) {
       rows.add((
         '当前库存',